
import java.util.Scanner;

public class SpeciesFourthTry
{
     private String name;
     private int population;
     private double growthRate;

     public void readInput( )
     {
         Scanner keyboard = new Scanner(System.in);
         System.out.println("What is the species' name?");
         name = keyboard.nextLine( );

         System.out.println("What is the population of the species?");
         keyboard = new Scanner(System.in);
         population = keyboard.nextInt( );

         System.out.println("Enter growth rate (% increase per year):");
         growthRate = keyboard.nextDouble( );
     }

     public void writeOutput( )
     {
          System.out.println("Name = " + name);
          System.out.println("Population = " + population);
          System.out.println("Growth rate = " + growthRate + "%");
     }

     /**
      Precondition: years is a nonnegative number.
      Returns the projected population of the calling object
      after the specified number of years.
     */
    public int predictPopulation(int years)
    {
		int result = 0;
        double populationAmount = population;
        int count = years;
        while ((count > 0) && (populationAmount > 0))
        {
            populationAmount = (populationAmount +
                          (growthRate / 100) * populationAmount);
            count--;
        }
        if (populationAmount > 0)
            result = (int)populationAmount;
	
        return result;
    }

    public void setSpecies(String newName,
                    int newPopulation, double newGrowthRate)
    {
        name = newName;
        if (newPopulation >= 0)
            population = newPopulation;
        else
        {
            System.out.println(
                       "ERROR: using a negative population.");
            System.exit(0);
        }
        growthRate = newGrowthRate;
    }

    public String getName( )
    {
        return name;
    }

    public int getPopulation( )
    {
        return population;
    }

    public double getGrowthRate( )
    {
        return growthRate;
    }
}
